Most human penis growth occurs in two stages: the first between infancy and the age of five and then between about one year after the onset of puberty and, at the latest, approximately 17 years of age. Compared to other primates, including large examples such as the gorilla, the human penis is thickest, both in absolute terms and relative to the rest of the body. Besides the natural variability of human penises in general, there are factors that lead to minor variations in a particular male, such as the level of arousal, time of day, ambient temperature, anxiety level, physical activity, and frequency of sexual activity. Human penises vary in size on a number of measures, including length and circumference when flaccid and erect. For other uses, see Big Dick (disambiguation).ĭiagram showing how to measure the length and circumference of an erect human penis
